Long string that do not contain empty spaces are breaking the preview section layout in text widgets

[madalincm]

Steps to Reproduce:

1. Open this dashboard: https://pipeline-sql.stage.mozaws.net/dashboard/-test-test
2. Click on the option button - edit for the text widget that contains "11111111111111" string

Expected results:

The preview section is displayed correctly

Actual results:

Long strings are breaking the preview section.

Notes/Issues:

Build identifier: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Verified in FF58(Win7). Issue can be reproduced in STMO-stage

[madalincm]

Verified in FF58(Win7x64) in stmo-stage
Issue is still reporducing:

[washort]

this is occurring in production (m12.1) as well.

[jezdez]

I think this was recently fixed upstream but can't find the commit right away.

[alison985]

Just checked this on pipeline-sql since the upstream merge work should be there now and it is still reproducing.

[jezdez]

Ah, dang, must have been a different commit I saw. Sorry for the noise.

[jezdez]

I've closed #423 since the parent PR getredash#2580 has been merged. We'll keep this issue open though until we've merged upstream.

[alison985]

The upstream changes should have been caught in the latest rebase from upstream, so I'm moving this to done so @madalincm can check it.

[madalincm]

Verified in FF61(Win7) in stmo-stage
Issue is no longer reproducing: